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The lift/propulsion method used by a helicopter is capable of producing an overall thrust vector with virtually no horizontal motion. The lift method of planes (fixed wing), requires movement to produce lift.
There are many possible helicopter configurations - most designs use some variation of multiple rotors placed in such a manner that rotational force is compensated for, allowing stable flight. Lift is able to be generated because the rotors (which are essentially just spinning wings) are still moving through the air, while the airframe overall stays in the same place.
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∙ 14y ago
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Why can't rescue helicopters fly in low air pressure?
I've never heard that. However, helicopters are limited to the altitude that they can hover, which would limit a Rescue helicopter from picking up a stranded mountain climber. In the high altitude, the air is "thinner" which means the air pressure is less. This limits the effiency of the rotor blades. However, usually the first indication of a problem is when a helicopter tries to hover at high altitude and the tail rotor looses it thurst and the helicopter goes into an uncontrolled spin. This was common with the Bell Model 206B. Even though a helicopter may be limited to the altitude at which it can hover, that does not mean it can't fly at that altitude. If a helicopter maintains a high forward air speed, it can still fly over mountains; its only when it stops and hovers that it may have problems.
How might an aeroplane fly like a helicopter?
It flies Like an Airplane and Hovers Like a Helicopter... or if the engine has enough power to it, and the pilot brings it up to a 90 degree climb, lets it slow down, then adjusts the throttle to hover the plane...
How do helicopters hover?
A helicopter moves forwards by the rotors spinning, and being slightly tilted. So if the rotors are flat, it will hover. This is because the air being pushed by the rotors is going straight down, not onto another surface, thereby making it go forwards.
How does the helicopter stay stationary in the air?
Two things keep a helicopter flying, and another keeps it flying straight. To take off: 1) The blades are shaped like the wings of an airplane and create a difference in pressure (high underneath the wing, low above). This difference in pressure "pushes" the helicopter upwards (lift). But because of gravity, however, there might not be enough lift to take off from the ground. 2) In order to take off, the blades must rotate at supersonic speeds (to be stronger than gravity's push downwards), this make it possible to gain altitude. To "Fly:" 1) A helicopter's blades in air act like a boat's propeller in water. If the blades rotate at an angle, it will start moving. To make the helicopter hover, the blades must be perfectly straight up. At the same time, the rotating blades make the helicopter itself rotate the other way (about the axis of rotation). In a GPS, the helicopter would not be going anywhere like this (with no angle on the blades), but the Direction at which it is looking will be changing in circles 2) Helicopters need a way to fix this crazy-out-of-control spinning. They can use a tail rotor for this, but they can also use a "twin" set of blades that rotate in opposite directions (counter-rotating blades). With the addition of counter-spinning blades, now the GPS will be pointing at 1 direction. in summary: 1) By keeping the blades rotating fast enough to be lifting with the same force as gravity is pushing down, the altitude is kept the same. 2) By keeping the Blades from spinning at an angle, the Helicopter does not move to the sides. 3) By using a counter-rotating blades set, the helicopter is able to keep looking at one direction. with these 3 things, Helicopter are able to hover in air, and their GPS can be kept and a fixed height, at fixed position on a map, and at a fixed direction.
Why Bernoulli's Principle makes an helicopter fly?
A helicopter uses Benoullis principle in the exact same way as an airplane does. A helicopter has a wing just like an airplane's wing. The major difference being that instead of pushing the wing forward through the air, a helicopter swings the wings around above its head.
How long can helicopter hover in the same spot?
Indeffinently within fuel limitations, or system temperatures.
Hover in a meaningful sentence?
One of the advantages of the helicopter is that it can hover over one spot.
How is a humming bird like a helicopter?
They are similar, but no, they are not the same.
How long can helicopter hover in the same spot close to the ground?
This will mostly depend on weath(wind/tubulence mostly). and in these conditions. the skills of the pilot. if perfect weather(for flying) until it runs out of fuel, or become unstablized.
How long can a helicopter hover?
A helicopter should be a be able to hover as long as it has fuel to. And the current atmospheric conditions and pilot fatigue levels permit.
Can code enforcement go through Littlerock CA door-to-door to gain access to backyards in order to seek violations to cite to generate revenue What about photos over the fence if denied access?
Yes. They could hover in a helicopter to obtain photos also.Yes. They could hover in a helicopter to obtain photos also.Yes. They could hover in a helicopter to obtain photos also.Yes. They could hover in a helicopter to obtain photos also.
What type of machine has rotor blades and can hover?
A helicopter.
How do you hover in a helicopter in gta 5 xbox 360?
A person can get the helicopter to hover in GTA 5 on Xbox 360 by using the controls and by holding the B button. A person needs to be careful when navigating to ensure the helicopter doesn't crash.
How invented the helicopter and when?
In the 1400's Leonardo invented the "idea" of a helicopter. In 1906 Paul Cornu got a helicopter to hover 3 feet off the ground, but it would not go anywhere. In the 1940's Igor Sikorsky invented a helicopter that would safely fly and hover.
Why won't a helicopter that hovers for 12hrs end up on the other side of the earth when it lands 12hrs later?
The helicopter that is hovering over a place on the earth is n bound to the earth by the gravitational force of the earth. This gravitational attractive force on the helicopter is directed towards the center of the earth. As the earth rotates around itself the helicopter is pulled along with it. So the point directly below the earth's surface does not get displaced. Thus the helicopter cannot move away from the spot. For the helicopter to get itself free from the gravitational pull of the earth it has to be lifted to a height of millions of kilometers, where it cannot hover because a helicopter requires the presence of air to hover.
How long does a helicopter hover?
It hovers as long as the fuel tank lasts.
Why helicopter flying?
Because they can land in small spaces and hover in flight
